[cisco-voip] DTMF and SIP Devices

[Philip Walenta]

The common denominator for DTMF in many environments is RFC2833.

Some (like Cisco) use atypical protocols for out-of-band signaling (in
Cisco's case they use a slightly obscure IETF RFC called KPML).

If you're talking a SIP trunk to your conference device, I would set the
trunk for RFC2833 and see if that fixes your issue.

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Mark Rudholm
Sent: Tuesday, August 24, 2010 4:37 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] DTMF and SIP Devices

In addition to the typical compliment of 79XX Cisco SCCP phones, I have 
a number of devices registered to CUCM 7.1.3 via SIP.  Devices like 
Polycom VVX 1500s and Tandberg teleconference units.  On calls between 
SIP devices I'm not getting proper DTMF signaling.  One of my SIP 
devices is a stand-alone conference bridge and the IVR mechanism can't 
work without DTMF.  I've looked in my device settings and my SIP profile 
settings and can't find anything that controls DTMF signaling mode.

Any pointers?

-Mark
_______________________________________________
cisco-voip mailing list
cisco-voip at puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip